define(function(require, exports, module) {
  var $ = window.Zepto;

  //     Zepto.js
  //     (c) 2010-2014 Thomas Fuchs
  //     Zepto.js may be freely distributed under the MIT license.

  // The following code is heavily inspired by jQuery's $.fn.data()

  var data = {}, dataAttr = $.fn.data, camelize = $.camelCase,
      exp = $.expando = 'Zepto' + (+new Date()), emptyArray = [];

  // Get value from node:
  // 1. first try key as given,
  // 2. then try camelized key,
  // 3. fall back to reading "data-*" attribute.
  function getData(node, name) {
    var id = node[exp], store = id && data[id]
    if (name === undefined) return store || setData(node)
    else {
      if (store) {
        if (name in store) return store[name]
        var camelName = camelize(name)
        if (camelName in store) return store[camelName]
      }
      return dataAttr.call($(node), name)
    }
  }

  // Store value under camelized key on node
  function setData(node, name, value) {
    var id = node[exp] || (node[exp] = ++$.uuid),
        store = data[id] || (data[id] = attributeData(node))
    if (name !== undefined) store[camelize(name)] = value
    return store
  }

  // Read all "data-*" attributes from a node
  function attributeData(node) {
    var store = {}
    $.each(node.attributes || emptyArray, function(i, attr) {
      if (attr.name.indexOf('data-') == 0)
        store[camelize(attr.name.replace('data-', ''))] =
            $.zepto.deserializeValue(attr.value)
    })
    return store
  }

  $.fn.data = function(name, value) {
    return value === undefined ?
      // set multiple values via object
        $.isPlainObject(name) ?
            this.each(function(i, node) {
              $.each(name, function(key, value) {
                setData(node, key, value)
              })
            }) :
          // get value from first element
            (0 in this ? getData(this[0], name) : undefined) :
      // set value on all elements
        this.each(function() {
          setData(this, name, value)
        })
  }

  $.fn.removeData = function(names) {
    if (typeof names == 'string') names = names.split(/\s+/)
    return this.each(function() {
      var id = this[exp], store = id && data[id]
      if (store) $.each(names || store, function(key) {
        delete store[names ? camelize(this) : key]
      })
    })
  }

    // Generate extended `remove` and `empty` functions
  ;
  ['remove', 'empty'].forEach(function(methodName) {
    var origFn = $.fn[methodName]
    $.fn[methodName] = function() {
      var elements = this.find('*')
      if (methodName === 'remove') elements = elements.add(this)
      elements.removeData()
      return origFn.call(this)
    }
  })
});
